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Radio receiver components, 1914 Wall Art, Canvas Prints, Framed Prints, Wall Peels | Great Big Canvas
![Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat](http://blogs.mhs.ox.ac.uk/innovatingincombat/files/2014/06/Marconi-Short-distace-radio.jpg)
Guest post by Keith Thrower: Technical factors affecting CW radio communication in WW1, part 2 - Innovating in Combat
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![A homemade Audion radio receiver constructed by an amateur radio hobbyist 1914. The Audion (triode), the first amplifying vacuum tube, was invented by Lee De Forest in 1907 but was not widely A homemade Audion radio receiver constructed by an amateur radio hobbyist 1914. The Audion (triode), the first amplifying vacuum tube, was invented by Lee De Forest in 1907 but was not widely](https://c8.alamy.com/comp/2DYX1KH/a-homemade-audion-radio-receiver-constructed-by-an-amateur-radio-hobbyist-1914-the-audion-triode-the-first-amplifying-vacuum-tube-was-invented-by-lee-de-forest-in-1907-but-was-not-widely-used-until-its-amplifying-ability-was-recognized-around-1913-so-this-is-one-of-the-earliest-vacuum-tube-radios-2DYX1KH.jpg)